在PHP Mysql中删除到期日期的行

<?php
// 连接到MySQL数据库
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 编写SQL查询语句
$sql = "SELECT * FROM table_name WHERE expiration_date < CURDATE()";

// 执行查询语句并获取结果集
$result = $conn->query($sql);

// 遍历结果集，逐行删除到期日期的行
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        $deleteSql = "DELETE FROM table_name WHERE id = " . $row["id"];
        if ($conn->query($deleteSql) === TRUE) {
            echo "成功删除行：" . $row["id"] . "<br>";
        } else {
            echo "删除行失败：" . $conn->error . "<br>";
        }
    }
} else {
    echo "没有到期日期的行需要删除";
}

// 关闭数据库连接，释放资源
$conn->close();
?>